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From: steven@mcvax.UUCP (Steven Pemberton)
Newsgroups: net.math
Subject: Re: palindromic primes
Message-ID: <6191@mcvax.UUCP>
Date: Wed, 21-Nov-84 09:26:27 EST
Article-I.D.: mcvax.6191
Posted: Wed Nov 21 09:26:27 1984
Date-Received: Fri, 23-Nov-84 03:07:39 EST
References: <164@faron.UUCP> <118@talcott.UUCP>
Reply-To: steven@mcvax.UUCP (Steven Pemberton)
Organization: CWI, Amsterdam
Lines: 13

In article <118@talcott.UUCP> gjk@talcott.UUCP (Greg J Kuperberg) writes:
> Of course, if you're willing to be live in base 2, the 15 or so largest
> known primes happen to all be palindromic.  They are also strings of ones.
> How big is the highest one, folks?  I think it's somewhere around 2^130,000
> (give or take a hundred orders of magnitude).

A Dutch paper recently dedicated a whole page to printing the decimal
representation of the highest (all 39,000+ digits) which had been calculated
here at the CWI using the following B program:

	WRITE 2**132049-1

Steven Pemberton, CWI, Amsterdam; steven@mcvax